If that's the case, this will be their biggest game yet. Besides ToR, if you count that.
We know that geographically (or in terms of level design) it's their biggest game ever, and the scope seems to be the most ambitious thing they've ever done - but it's not clear at this point whether that translates into "more content", and specifically more dialogue for all the characters. Maybe the voice acting budget is an obstacle to growing the amount of dialogue beyond a certain point, and I'm sure there are technical limitations in terms of the PS3/Xbox 360 disc sizes.
(And of course, the game can still be huge even if the companions only get roughly the same number of lines as in Origins/DA2. Nothing says the companion dialogue has to scale in size with the rest of the game, and maybe someone decided to pour all the zots into quest content or massive levels rather than companion conversations. Who knows, at this point?)